JERUSALEM — Israel’s military intelligence chief said on Tuesday that President Bashar al-Assad of Syria had moved forces to Damascus from along the Golan Heights region, bordering on Israeli-controlled territory, after street battles raged in the capital between rebels and Syrian Army forces.

In a security briefing to a parliamentary committee, the intelligence chief, Maj. Gen. Aviv Kochavi, estimated that Mr. Assad “will not survive the uprising, even if it takes some more time.” He said that 13,000 soldiers and officers had defected from the Syrian Army, and that 60 to 70 senior officers had been killed by the opposition, according to the spokesperson’s office of the Israeli military.

But the general said the opposition had failed to coalesce into a united front and instead comprised many groups with different ideologies. “We don’t see organized opposition forces leading an uprising,” General Kochavi said.

In the briefing, the general said that satellite images show that Mr. Assad’s forces are directing artillery at highly populated regions and acting “extremely brutally, which displays their desperation and indicates they are unable to find more efficient solutions to pacify the uprisings.”

Israel has been closely monitoring events in Syria, a country with which it has no relations and is technically in a state of war, and has expressed particular concern about the fate of Syria’s stocks of chemical weapons. American officials said on Friday that Syria had started moving some parts of its huge stockpile of chemical weapons, though it was uncertain why.

General Kochavi said that Iran and Hezbollah, the Lebanese Shiite militant organization that has long been an ally of Syria and Iran, are preparing for Mr. Assad’s demise and the days after, and that the Israeli military was concerned that “strategic weapons and firearms from Syria will end up in their hands.”

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“In Lebanon there are currently between 70 and 80 thousand rockets that might be used to target Israel,” General Kochavi said. “The smuggling of rockets from Iran to Lebanon continues.”

When President Vladimir V. Putin of Russia was in Jerusalem last month, President Shimon Peres asked him to “act with urgency” to prevent nonconventional weapons from Syria falling into the hands of organizations such as Hezbollah and Al Qaeda.

General Kochavi expressed concern that the Golan Heights region might become “a terror hotbed,” similar, he said, to the Egyptian Sinai Peninsula since the fall of the President Hosni Mubarak. Israel has a decades-old peace treaty with Egypt but over the last year Israeli security officials have pointed to an erosion of Egyptian sovereignty and authority in the vast expanses of Sinai Desert. Militants operating from Sinai have carried out two attacks in which Israeli civilians were killed since last summer. A number of rockets have also been fired from Sinai into southern Israel this year, landing in open areas.

Israel captured part of the Syrian Golan Heights, a strategic plateau overlooking northern Israel, in the 1967 Middle East war. Israel extended Israeli law to the area in 1981, effectively annexing the territory. It has since engaged in some inconclusive rounds of negotiations to return it to Syria in return for a peace treaty.

But General Kochavi said that there was a low probability of conflict now between Israel and Syria, even as a “last resort” for Mr. Assad in his quest for the survival of his government. That Mr. Assad is moving troops away from the disengagement line with Israel and toward Damascus was a sign, General Kochavi said, that Mr. Assad “is not concerned conflict will emerge with Israel.”